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OEM Carrier Transformer 40VA 120V-24V for FF1DNA018005ABAA
Carrier

OEM Carrier Transformer 40VA 120V-24V for FF1DNA018005ABAA

SKU: CARRIE-FF1DNA018005ABAA-TRANSFORMER-HT01CN236 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Transformer 40VA 120V to 24V for Model FF1DNA018005ABAA

This is the factory OEM replacement transformer (part number HT01CN236) for the Carrier FF1DNA018005ABAA fan coil unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dead — your thermostat will appear unresponsive, the system will not call for heating or cooling, and no components will energize regardless of thermostat setting.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | Hardwired leads | Factory-matched to OEM electrical specifications for Carrier FF1DNA018005ABAA
  • OEM vs Generic: This OEM unit is wound and rated to exact Carrier factory specifications, ensuring correct VA output and thermal protection. Generic transformers may be undersized in VA rating, leading to premature failure under full control circuit load.
  • Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Confirm 24V output with a multimeter after installation before restoring full power. Photograph existing wiring before disconnecting.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Designed specifically for the Carrier FF1DNA018005ABAA fan coil unit. Verify your existing transformer's primary/secondary voltage and VA rating on the data plate or wiring diagram before ordering. If you are unsure of fitment, our team is available to verify compatibility before you purchase. Order today for same-day shipping.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $75
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Transformer fit my Carrier FF1DNA018005ABAA?
Yes. This is the factory-specified OEM transformer for the Carrier FF1DNA018005ABAA. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the transformer on my Carrier FF1DNA018005ABAA?
Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.
My thermostat has no power. What failed?
Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.
Is this transformer compatible with Bryant or Payne too?
Many Carrier parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Carrier transformer?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
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